Lego Trans-Light Blue Horse 41168 with 2 x 2 Cutout Long Swooshy Tail Minifigure | eBay
BrickLink - Part 76950c01pb01 : LEGO Horse with 2 x 2 Cutout and Movable Neck, Light Aqua Tail and Mane, Metallic Light Blue Eyes and Stars Pattern [Animal, Land] - BrickLink Reference Catalog
Lego(R) Horse Barding, Armor Gold & Blue Ninja Pattern – Atlanta Brick Co
LEGO part 18832c02 - Medium Blue Minifig, Costume Tail Horse with Blue Ends Pattern at BrickScout